That's an idealistic view of things. What's really happening is that human beings banded together to protect their mutual interests on multiple, fractal levels on the way up. Individuals formed families, which formed communities, which formed towns and neighborhoods and cities, all the way up to nation-states. The difference is, there's no stable mechanism, other than humanitarian good feelings, for the people of the United States and the people of Pakistan to respect each other's mutual interests, so they pursue their interests in opposition to one another.